This chart compares the heat released by the spent fuel and vitrified waste represented in the previous diagrams, assuming that all fission products from the spent fuel are still present in the vitrified waste. Based on this data, a vitrified waste container requires 2.15 spent fuel assemblies. Removing the plutonium significantly reduces the heat released, by 30% after 35 years and 60% after 100 years. This decrease would enable smaller disposal facilities to be used.

IN2P3 (data taken from the 2004 report by the national assessment commission)